So, you want to post a YouTube video to Facebook? Well, believe it or not, it's a really simple task to complete. Instead of just copying and pasting the URL into your comment box, Facebook has the option to choose a "link", which you would then copy and paste the YouTube URL into that box. Then you just click "share" and your whole Facebook community can now watch the YouTube video directly on Facebook. It's the easiest way to share videos with your Facebook friends.